Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2<sup>63</sup> - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.
{
"github_reviewed_at": "2023-07-25T19:54:26Z",
"severity": "HIGH",
"github_reviewed": true,
"cwe_ids": [
"CWE-20"
],
"nvd_published_at": "2018-05-02T16:29:00Z"
}